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Accessibility Issues in Ad-Driven Web Applications

Abdul Haddi Amjad, Muhammad Danish, Bless Jah, Muhammad Ali Gulzar

TL;DR

This first-of-its-kind large-scale investigation of 430 K website elements, including nearly 100 K ad elements, to understand the prevalence of inaccessible ads and their overall impact on the accessibility of websites shows that 67 % of websites experience increased accessibility violations due to ads.

Abstract

Website accessibility is essential for inclusiveness and regulatory compliance. Although third-party advertisements (ads) are a vital revenue source for free web services, they introduce significant accessibility challenges. Leasing a websiteś space to ad-serving technologies like DoubleClick results in developers losing control over ad content accessibility. Even on highly accessible websites, third-party ads can undermine adherence to Web Content Accessibility Guidelines (WCAG). We conduct the first large-scale investigation of 430K website elements, including nearly 100K ad elements, to understand the accessibility of ads on websites. We seek to understand the prevalence of inaccessible ads and their overall impact on the accessibility of websites. Our findings show that 67% of websites experience increased accessibility violations due to ads, with common violations including Focus Visible and On Input. Popular ad-serving technologies like Taboola, DoubleClick, and RevContent often serve ads that fail to comply with WCAG standards. Even when ads are WCAG compliant, 27% of them have alternative text in ad images that misrepresents information, potentially deceiving users. Manual inspection of a sample of these misleading ads revealed that user-identifiable data is collected on 94% of websites through interactions, such as hovering or pressing enter. Since users with disabilities often rely on tools like screen readers that require hover events to access website content, they have no choice but to compromise their privacy in order to navigate website ads. Based on our findings, we further dissect the root cause of these violations and provide design guidelines to both website developers and ad-serving technologies to achieve WCAG-compliant ad integration.

Accessibility Issues in Ad-Driven Web Applications

TL;DR

This first-of-its-kind large-scale investigation of 430 K website elements, including nearly 100 K ad elements, to understand the prevalence of inaccessible ads and their overall impact on the accessibility of websites shows that 67 % of websites experience increased accessibility violations due to ads.

Abstract

Website accessibility is essential for inclusiveness and regulatory compliance. Although third-party advertisements (ads) are a vital revenue source for free web services, they introduce significant accessibility challenges. Leasing a websiteś space to ad-serving technologies like DoubleClick results in developers losing control over ad content accessibility. Even on highly accessible websites, third-party ads can undermine adherence to Web Content Accessibility Guidelines (WCAG). We conduct the first large-scale investigation of 430K website elements, including nearly 100K ad elements, to understand the accessibility of ads on websites. We seek to understand the prevalence of inaccessible ads and their overall impact on the accessibility of websites. Our findings show that 67% of websites experience increased accessibility violations due to ads, with common violations including Focus Visible and On Input. Popular ad-serving technologies like Taboola, DoubleClick, and RevContent often serve ads that fail to comply with WCAG standards. Even when ads are WCAG compliant, 27% of them have alternative text in ad images that misrepresents information, potentially deceiving users. Manual inspection of a sample of these misleading ads revealed that user-identifiable data is collected on 94% of websites through interactions, such as hovering or pressing enter. Since users with disabilities often rely on tools like screen readers that require hover events to access website content, they have no choice but to compromise their privacy in order to navigate website ads. Based on our findings, we further dissect the root cause of these violations and provide design guidelines to both website developers and ad-serving technologies to achieve WCAG-compliant ad integration.
Paper Structure (18 sections, 1 equation, 9 figures, 4 tables)

This paper contains 18 sections, 1 equation, 9 figures, 4 tables.

Table of Contents

  1. Introduction
  2. Motivating Example
  3. Research Questions
  4. Methodology
  5. Websites Visited
  6. Blocking Website Advertisements
  7. Accessibility Evaluation
  8. Results
  9. RQ1: Impact of Advertisements on Accessibility Violations
  10. RQ2: Common Accessibility Violations in Advertisements
  11. Prevalent Violations in Ad Elements ($R_{only-ads}$)
  12. Violations in Ad Elements ($R_{only-ads}$) vs. Non-ads Website Elements $R_{without-ads}$
  13. RQ3: Most Prevalent Ad-Serving Technologies on Websites with Ad Serving Violations
  14. Misrepresentation of Alt Text in Advertisements
  15. Discussion and Takeaways
  16. ...and 3 more sections

Figures (9)

  • Figure 1: Accessibility report for alaskasnewssource.com, highlighting the count of accessibility violations, which are 126 when the website is visited without ads and 279 when inspected with ads.
  • Figure 2: Violation identified in Taboola ad slots and its impact on how screen reader users experience the website.
  • Figure 3: Overview of our methodology involving generating accessibility reports for each website with ($R_{with-ads}$) and without ads ($R_{without-ads}$), then comparing them to isolate and analyze the accessibility violations caused by only ads ($R_{ads-only}$).
  • Figure 4: CDF plot of websites by accessibility guideline violations in ad elements ($R_{only-ads}$).
  • Figure 5: Histogram of the number of websites by accessibility guideline violations in ad elements ($R_{only-ads}$).
  • ...and 4 more figures